Seat-hinge.



N0. 741,000. 0 0 PATENTED OCT. 0, 19-03.

- L. D. PETRE.

- SEAT HINGE.

7 APPLICATION P1021) AUG. 11, 1902. N0 MODEL.

tamed; October 6, recs.

PATENT LEWIS D. PETRE, OF CHICAGO, ILLINOIS.

SEAT-HINGE.

$PEGIFICATION forming part of Letters Patent No. 741,000, dated October 6 1903. Application filed August 11, 1902. Serial No. 119.339- (No model.)

To ctZZ whom it may concern:

Be it known that I, LEWIS D. PETRE, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Seat-Hinges, of which the following, when taken in connection with the drawings and reference-letters thereon and forming a part hereof, is a full and complete description.

The invention relates to seat-hinges for opera-chairs, school-desks, and other articles of furniture having a hinged seat.

The object of my invention is to obtain a simply-constructed friction -hinge whereby the seat may be easily and noiselessly raised or lowered.

Figure 1 of the drawings isa side elevation of the hinge. Gap F (shown in Figs. 5 and 6) is removed to expose to View an elliptical projection, movable abutment, and a spring placed in the hollow of the immovable part. The seat-arm is shown atthe point midway between its position while'in use as a seat and when raised. Fig. 2 is also a side elevation of the hinge with cap F removed, so as to show the relative positions of the elliptical projection, movable abutment, and spring when the seat-arm is lowered to its position while in use as a seat. Fig. 3 is a vertical sectional view on line 3 3, viewed in the direction indicated by arrows in Fig. 1, with the cap F attached. Fig. 4: shows the elliptical projection of the seat-arm, portions of the seat-arm being broken away. Fig. 5 is a side elevation of the cap, which has been removed in Figs. 1 and 2. Fig. 6 is a view of the edge of said cap.

A, Figs. 1 and 2, is the immovable part of the hinge, which is a hollow, cast-iron piece, the central part being hollow, so as to admit the elliptical projection b of seat-arm B and to allow its turning therein and also sufficiently large to admit a movable abutment C and spring I). Said immovable part A is provided with projections a 0. as clearly shown in Figs. 1 and 2.

C is a movable abutment placed upon the elliptical projection 19 and of such shape that when the seat-arm B is in the position indicated in Fig. 1 the under surface of said movable abutment will be tangent to the elliptical projection b at its central point. D is a spring,

interposed between said movable abutment G and the small projections a and a yieldingly holding the hinge in a working position. F, Figs. 5 and 6, isacap which is attached to immovable part A by means of bolt G. Said cap can be removed from the immovable part and permits said immovable part to be molded as one piece. Cap F is somewhat smaller than the immovable part A, so that it can be fitted against edges a a 0. so that the outer surface will be flush with the edge of said immovable part. The said cap F is provided with a circular shoulder e, placed at right angles with it, as shown in Fig. 6. Side H is molded as part of immovable part A and has an opening I,Figs. l and 2, so iiticientl y large to admit the elliptical projection b when the hinge is assembled and also large enough to allow the seat-arm B to turn when it is raised or lowered. Said side is also provided with a cir-' cular shoulder h at rightangles thereto, extending into the hollow of immovable part A, similar to and opposite shoulder e, as shown in Fig. 3. Shoulder e is of such shape and length that it can be inserted into a circular recess J of elliptical projection 21, as shown in Fig. 3. Shoulder h is similar to shoulder c and fits into a circular recess on the opposite side of the elliptical projection 1?, (see Fig. 3,) which shows the shoulders ex tending into circular recesses on both sides of said elliptical projection. Said recesses are at a point midway between the foci of the 8 elliptical projection. A small bolt G passes through a hole in the elliptical projection I). Said bolt also passes through holes in shoulders e and h and attaches cap F with immovable part A. It should be noted in this con- 0 nection that said bolt G is used for'the purpose of attaching the cap to the immovable part A exclusively and does not provide a means upon which the elliptical projection in rests or turns. The said bolt may be much 5 smaller than the hole in the elliptical projection I), provided it is sufiioiently large to hold the cap to the immovable part A.

K K are means whereby the hinge may be attached to a seat-standard, or, if desired, :00 they may be discarded and the immovable part be castas part of a seat-standard, as in the case of a school-desk.

In lowering the seat-arm B from the posi= tion shown in Fig. l to its position while in use as a seat, as shown in Fig. 2, the elliptical projection 1) partially revolves around shoulders e and it within the circular recesses therein, and b of said elliptical projection Z2 gradually raises and with a constantly-increasing pressure forces the movable abutment 0 upward. Said movable abutment is constantly retardedin its upward motion by spring D until the spring is forced against projection a, thus causing the turning motion to stop, and holds the seat-arm in its proper position, as shown in Fig. 2. During the turning of the elliptical projection b the tension of spring D holds the elliptical projection b tangent to the circular shoulders e and it within the circular recesses therein.'

When the seat-arm B is raised, it is stopped by the opposite end of the elliptical projection I), forcing the spring D against projection (1 In a similar manner it is stopped and held in proper position.

It will be readily seen that the'constantlyincreasing resistance to the movable abutment C by spring D prevents slamming of the seat when the seat-arm is either raised or lowered and that spring D also insures perfect contact between the bearings of the hinge during the turning motion of the elliptical projection b, and thus prevents any rattling sound.

In assembling the hinge the'elliptical projection b is passed through the opening I of the side I-I into the hollow of immovable part A, so that the circular shoulder h will extend into a circular recess of the elliptical part. The spring D is then placed against projections at and a after which movable abutment (3 may be inserted. Cap F is then placed against edges a a a so that shoulder 6 will extend into circular recess J of elliptical part b, after which bolt G may be passed through the holes in the shoulders e h and elliptical projection 19.

I claim 1. The combination of a hollow immovable part having small projections extending into said hollow, and also provided with a circular shoulder extending into said hollow at right angles to a side of the said immovable part;

a cap, attached to the immovable part by a bolt and supported at its circumference on the immovable part, and having a circular shoulder extending into the hollow of the immovable part at right angles to the said cap; a seat-arm, provided with an elliptical projection, having circular recesses on both sides of the elliptical projection, into which the circular shoulders extend and support the seat-arm; a movable abutment placed upon the elliptical projection Within the hollow of immovable part; a spring interposed between the immovable abutment and projections of the immovable part, and a bolt attaching the cap to the immovable part substantially as and for the purposes described.

2. The combination of a hollowimmovable part A, having projections a and a also having a circular shoulder 77, at right angles to side H of the immovable part, extending. into the said hollow; a cap F supported by the edges a a a of the immovable part A and having a circular shoulder e, extending at right angles thereof into the hollow immovable part A; the seat-arm B provided With the elliptical projection 17 having recesses on each side thereof, placed within the hollow of the immovable part A, and supported by the circular shoulders eand h engaging such recesses; the movable abutment O, placed Within the central opening of the immovable part A, upon the elliptical projection 17; the spring D interposed between the movable abutment O and the projections a and a and the bolt G connecting and holding the cap F to the immovable part A, substantially as and for the purposes described.

LEWIS ID. PETRE.

Witnesses:

WILL H. CLARK, HATTIE B. LEHMAN. 

